Tektronix P5102 User manual

P5102
100 MHz High-Voltage Probe
Instructions
070-9294-01

Copyright Tektronix, Inc. 1995. All rights reserved.
Tektronix products are covered by U.S. and foreign patents, issued and
pending. Information in this publication supercedes that in all previously
published material. Specifications and price change privileges reserved.
Printed in the U.S.A.
Tektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000
TEKTRONIX, TEK, TekTools, and TekScope are registered trademarks of
Tektronix, Inc.

P5102 Instructions i
Table of Contents
General Safety Summary iii. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Features and Accessories 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Basics 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Non-destructive Input Voltage 5. . . . . . . . . . . . . . . . .
Common Lead Length 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe Loading 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustment Procedures 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LF Compensation 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HF Compensation 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Verification 13. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning Instructions 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Customer Support 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparation for Shipment 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replaceable Parts 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents
ii P5102 Instructions
List of Figures
Figure 1: Waveform Distortion from Common Lead Length 5. .
Figure 2: Probe Loading Equivalent Circuit 6. . . . . . . . . . . . . . .
Figure 3: LF Compensation Setup 7. . . . . . . . . . . . . . . . . . . . . . .
Figure 4: LF Compensation Adjustment 8. . . . . . . . . . . . . . . . . .
Figure 5: Signal Source Characteristics for HF Compensation 8.
Figure 6: Opening the Compensation Box 9. . . . . . . . . . . . . . . .
Figure 7: HF Compensation Setup 10. . . . . . . . . . . . . . . . . . . . . .
Figure 8: HF Compensation Adjustments 11. . . . . . . . . . . . . . . . .
Figure 9: HF Compensation Regions of Fast Rise Signal 12. . . . .
Figure 10: Bandwidth Test Setup 14. . . . . . . . . . . . . . . . . . . . . . .
Figure 11: Maximum Voltage Derating Curves
(VRMS, DC Coupled) 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 12: Typical Input Impedance 19. . . . . . . . . . . . . . . . . . . . .
Figure 13: Typical Input Phase 20. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 14: P5102 Replaceable Parts 22. . . . . . . . . . . . . . . . . . . . .
List of Tables
Table 1: Required Test Equipment 13. . . . . . . . . . . . . . . . . . . . . .
Table 2: Warranted Electrical Specifications 17. . . . . . . . . . . . . . .
Table 3: Typical Electrical Characteristics 19. . . . . . . . . . . . . . . .
Table 4: Typical Mechanical Characteristics 21. . . . . . . . . . . . . .
Table 5: Environmental Specifications 21. . . . . . . . . . . . . . . . . . .

P5102 Instructions iii
General Safety Summary
Review the following safety precautions to avoid injury and prevent
damage to this product or any products connected to it.
Only qualified personnel should perform service procedures.
Injury Precautions
Avoid Electric Overload. To avoid injury or fire hazard, do not apply
potential to any input, including the common inputs, that varies from
ground by more than the maximum rating for that input.
Avoid RF Burns While Handling Probe. To avoid RF burns, do not handle
the probe while the common lead is connected to circuits above the
voltage and frequency limits specified in Figure 11b on page 18.
Avoid Electric Shock. To avoid injury or loss of life, do not connect or
disconnect probes or test leads while they are connected to a voltage
source.
Do Not Operate Without Covers. To avoid electric shock or fire hazard,
do not operate this product with covers or panels removed.
Do Not Operate in an Explosive Atmosphere. To avoid injury or fire
hazard, do not operate this product in an explosive atmosphere.
Keep Probe Surface Clean and Dry. To avoid electric shock and
erroneous readings, keep probe surface clean and dry.
Product Damage Precautions
Do Not Operate With Suspected Failures. If you suspect there is damage
to this product, have it inspected by qualified service personnel.
Do Not Immerse in Liquids. Clean the probe using only a damp cloth.
Refer to cleaning instructions on page 15.
Safety Terms and Symbols
Terms in This Manual. These terms may appear in this manual:

General Safety Summary
iv P5102 Instructions
WARNING. Warning statements identify conditions or practices that
could result in injury or loss of life.
CAUTION. Caution statements identify conditions or practices that
could result in damage to this product or other property.
Terms on the Product. These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you
read the marking.
WARNING indicates an injury hazard not immediately accessible as
you read the marking.
CAUTION indicates a hazard to property including the product.
Symbols on the Product. These symbols may appear on the product:
ProtectiveGround
(Earth)Terminal ATTENTION Refer to Manual Double Insulated
DANGER
High Voltage
Certifications and Compliances
Compliances. Consult the product specifications for Overvoltage
Category and Safety Class.
Overvoltage Category. Overvoltage categories are defined as follows:
CAT III: Distribution level mains, fixed installation
CAT II: Local level mains, appliances, portable equipment
CAT I: Signal level, special equipment or parts of equipment,
telecommunication, electronics

P5102 Instructions 1
Features and Accessories
The P5102 is a high-voltage passive probe designed for use with
TekScope THS 700 series instruments. The probe features a floating
common and is ideal for measuring and troubleshooting power
supplies and high-voltage devices. The probe provides 10X
attenuation of signals up to 1000 VRMS and derated performance up
to 100 MHz. The P5102 probe is certified to international safety
standards.
The P5102 probe has features and accessories to make high-voltage
measurements safer and easier. Please take a moment to familiarize
yourself with these features and accessories and their uses.
WARNING. Do not substitute accessories from other products for
those provided with the P5102. The accessories for the P5102 have
been safety tested. The use of non-tested accessories may cause
injury.
P5102 Features and Standard Accessories
Probe
Common
6-32 Probe Tip
Finger
Guard Probe Body – The P5102 probe body is designed for personal
safety, ergonomic comfort, and signal fidelity.
The finger guard provides protection when the hook tips are not being
used. Keep your fingers behind the finger guard whenever possible to
reduce the risk of a shock from the circuit under test.
The probe tip is a 6–32 threaded post that accepts both standard and
optional accessories.
Keepthe probebodyand accessoriescleantoreducetheriskofshock
due to surface conduction.

Features and Accessories
2P5102 Instructions
P5102 Features and Standard Accessories (Cont.)
Compensation Box – The compensation box contains low- and
high-frequencycompensationadjustments.Thehigh-frequencyadjust-
ments are accessible by removing the compensation box cover. Refer
to Adjustments on page 7.
Adjustment Tool – Use the supplied adjustment tool for probe
compensation adjustments. Do not use metallic or conductive tools
while making adjustments.
Matching
Markers
Color Markers – The matching markers help you identify probe
inputs at a glance. Clip one marker near the probe head and the
matching marker near the compensation box as shown.
Small Hook Tip – Use the small hook tip for making connections to
small conductors such as component leads.
Install the small hook tip by sliding it over the body of the probe and
screwing it onto the threaded probe tip.
To use the tip, hold the probe body and pull the tip shield back. Hook
the tip onto the circuit and release the shield. The hook tip will firmly
hold the conductor under test.

Features and Accessories
P5102 Instructions 3
P5102 Features and Standard Accessories (Cont.)
Large Hook Tip – Use the large hook tip when working with larger
components such as bolt terminals and buss bars typically found in
power distribution equipment.
Install the large hook tip by sliding it over the body of the probe and
screwing it onto the threaded probe tip.
Tousethetip,holdtheprobebodyandpullthetipshieldback.Hookthe
tipontothecircuitandreleasetheshield.Thehooktipwillfirmlyholdthe
conductor under test.
Common Leads – The P5102 probe comes with a long and a short
floating common lead. Both common leads connect to a removable
crocodile clip.
Attachthe common leadto theprobe bodyby insertingtheprobe head
into common lead as shown.
The length of the common lead directly impacts the fidelity of high-fre-
quency signals. The longer the common lead, the more the signal will
be distorted. For more information about the common lead and signal
quality, go to page 5.
Crocodile Clip – The large crocodile clip attaches to the insulated
banana connector on the common leads.
WARNING. For safe electrical connections, use the crocodile clip
provided. Do not attempt to substitute the crocodile clip with any
other accessory.

Features and Accessories
4P5102 Instructions
P5102 Optional Accessories
Probe Tip Extender (P6000) – Use the probe tip extender to con-
nectthe probeto largertest socketslocatedinequipmentoronprinted
circuit boards.
Connect the probe tip extender by screwing it onto the threaded
probe tip.
Ground
Clip
Probe
Common
Probe-to-BNC Adapter – Use the probe-to-BNC adapter to
connect the probe directly to BNC connectors. The adapter is
recommended for use when verifying or adjusting the probe.
Attach the adapter by pressing it onto the 6-32 probe tip and making
sure that the ground clip makes contact with the probe common.
WARNING. Do not connect the adapter to a floating or high-voltage
source. The BNC adapter is only rated to 500 V (DC + peak AC)
with the probe common connected to earth ground.

P5102 Instructions 5
Operating Basics
To get guaranteed performance from the P5102 probe, please read
and apply the information in this section.
Observe Voltage Derating Information
WARNING. To avoid personal injury, do not handle the probe when
the common lead is connected to a source that is above the voltage
and frequency limits given in Figure 11b on page 18.
To avoid personal injury or damage to the probe, do not connect the
probe input to a source that is above the maximum non-destructive
input voltage and frequency limits given in Figure 11a on page 18.
Common Lead Length
Always use as short a common lead as possible between the probe
head and circuit common for high frequency or fast rise time signals.
The input capacitance of the probe and the series inductance added
by the probe tip and common lead can result in a resonant circuit;
this circuit may cause parasitic “ringing” visible within the
bandwidth of your oscilloscope. Refer to Figure 1.
6-inch Common 18-inch
Common
Figure 1: Waveform Distortion from Common Lead Length

Operating Basics
6P5102 Instructions
Parasitic ringing is not a concern when the probe is used with low
frequency or slow rise time signals and is not apparent if the
frequency content is beyond the bandwidth of the oscilloscope.
Probe Loading
When you touch your probe tip to a circuit element, you are
introducing a new resistance, capacitance, and inductance into the
circuit. Refer to Figure 2.
Rsource
Vsource Probe Cin
11.2 pF
Probe Rin
5M
L
cl (common lead)
Figure 2: Probe Loading Equivalent Circuit
Frequency and impedance of the source determine how much the
probe loads the circuit you are measuring. As the frequency of the
source starts to increase beyond 1 kHz, the input impedance of the
probe begins to decrease. The lower the impedance of the probe
relative to that of the source, the more the probe loads the circuit
under test. Refer to Figure 12 on page 19 for a graph of frequency
versus input impedance.
The probe has virtually no loading effect on sources with relatively
low impedance and low frequency.

P5102 Instructions 7
Adjustment Procedures
The low-frequency (LF) compensation of the P5102 probe must be
checked every time the probe is connected to a different oscilloscope
input.
The high-frequency (HF) compensation should be checked if the
probe was repaired or fails to meet rated bandwidth specifications.
Check the probe using the performance verification procedures on
page 13 to determine if adjustment is required.
LF Compensation
Before taking any measurements with the probe, first check the LF
compensation of the probe and adjust it to match the channel input it
is connected to.
1. Connect the probe to the Probe Comp signal on your TekScope
instrument and then press AUTORANGE. See Figure 3.
Probe tip to PROBE COMP
Probe reference lead to
Ch 1
AUTORANGE
Figure 3: LF Compensation Setup

Adjustment Procedures
8P5102 Instructions
2. Compensate the probe by adjusting the trimmer in the probe
compensation box so that the corners of the signal are square. See
Figure 4.
LF
[1 kHz
Figure 4: LF Compensation Adjustment
HF Compensation
To compensate the probe for high frequencies, you will need a
properly terminated signal source that has the characteristics given in
Figure 5. Refer to Table 1 on page 13 for a complete list of required
test equipment.
1 MHz
1 Vpp
tr<1 ns
90%
10%
Figure 5: Signal Source Characteristics for HF Compensation
To access the HF adjustments of the probe, you must open the cover
of the compensation box using the procedure that follows.

Adjustment Procedures
P5102 Instructions 9
Opening the Compensation Box
NOTE. This procedure should be performed by qualified service
personnel only.
To open the cover, obtain two small screwdrivers and use them to
unlatch the tab as shown in Figure 6.
WARNING. Avoid damaging the tab. A damaged tab will allow the
cover to easily separate and expose the user to the electrical
potential of the common connection.
To avoid damaging the tab, do not attempt to press on the tab
through the hole in the cover where it latches. In the event of a
damaged tab, replace the probe.
1. Insert the flat blade of small screwdriver (A) into the location
shown in Figure 6. Insert the blade until it stops against the back
of the tab.
Tab
Insert up to the Tab
A
B
Figure 6: Opening the Compensation Box

Adjustment Procedures
10 P5102 Instructions
2. While holding screwdriver (A) in place, insert small screwdriver
(B) between the ridge on the front of the compensation box and
the edge of the cover.
3. Gently twist the blade of screwdriver (B) to separate the cover
and unlatch the tab.
4. After unlatching the tab, slide the cover back to expose the
internal adjustments.
HF Compensation Procedure
After opening the compensation box, perform the following
procedure to compensate the probe for high frequencies.
1. Connect a 50 feedthrough termination to the positive going
FAST RISE output of the calibration generator. See Figure 7.
Calibration
Generator
Probe-to-BNC Adapter
P5102 Probe
FASTRISE Output
50 WTerminator
Figure 7: HF Compensation Setup
2. Refer to page 4 and use the optional probe-to-BNC adapter to
connect the probe to the termination.
3. Set the Calibration Generator to 1 MHz.
4. Set the PULSE AMPLITUDE to 0.5 VP-P .

Adjustment Procedures
P5102 Instructions 11
NOTE. If you have changed the default setting for the probe type,
access the vertical menu of the TekScope instrument and return the
setting to 10X.
5. Set the oscilloscope to 100 mV/division.
6. Set the oscilloscope averaging to 4.
7. Set the oscilloscope to 10 ns/div (100 ns, X10 magnification)
Adjust the oscilloscope as necessary to view the leading edge of
the waveform.
8. Locate the HF1 and HF2 adjustments. See Figure 8.
HF2
HF1
Figure 8: HF Compensation Adjustments
9. Preset HF1 counterclockwise and HF2 clockwise.
10.Adjust HF2 for flatness and adjust HF1 for the best front corner.
See Figure 9. Because HF1 and HF2 interact, readjust HF2 and
HF1 as necessary to achieve the best rise time with the smallest
aberrations.

Adjustment Procedures
12 P5102 Instructions
HF1
(10 ns)
HF2
(20ns)
6%
Aberrations
Figure 9: HF Compensation Regions of Fast Rise Signal
11. After compensating the HF, carefully slide the cover back until
the tab latches securely into place.

P5102 Instructions 13
Performance Verification
Use the procedure in this section to verify that the P5102 probe
meets the warranted bandwidth specification highlighted with
boldface type in the Specifications section on page 17. The steps of
this procedure must be performed in the order given using a THS 720
TekScope instrument and other equipment that meets the minimum
requirements listed in Table 1.
Table 1: Required Test Equipment
Description MinimumRequirements Example
Oscilloscope Use a THS 720 only. The
probe is optimized to match
the input characteristics and
bandwidth of the THS 720
THS 720
Calibration Generator
(for HF adjustment only) ≤1 ns rise time square wave
W
a
vete
k
9
100 Un
ivers
a
l
Calibration System with
Oscilloscope C libr tio
Leveled Signal Generator 50 kHz to 250 MHz
Oscilloscope
C
a
libr
a
tio
n
Module (Option 250)
Termination, 50 W
feedthrough 50 Wmale to female BNC Tektronix 011-0049-01
Adapter, probe tip to BNC Probe tip to male BNC Tektronix 013-0291-00
NOTE. Compensate the probe for LF before performing this
procedure. The LF compensation procedure begins on page 7.
If the probe does not meet the bandwidth requirement of this
procedure, perform the adjustments beginning on page 7 and retest.

Performance Verification
14 P5102 Instructions
1. Connect the test setup as shown in Figure 10.
Leveled
Sine Wave
Generator
Probe Tip to
BNC Adapter
P5102 Probe
50 WTerminator
Output
Test
Oscilloscope
Figure 10: Bandwidth Test Setup
2. Set the leveled signal generator output frequency to 1 MHz.
NOTE. If you have changed the default setting for the probe type,
access the vertical menu of the TekScope instrument and return the
setting to 10X.
3. Set the oscilloscope to 50 mV/division. (The effective setting
with the 10X attenuation of the probe is 500 mV/division.)
4. Adjust the Leveled Signal Generator for a display exactly 6
divisions peak-to-peak.
5. Increase the Leveled Signal Generator frequency until the display
is 4.2 divisions peak-to-peak. (This represents the .707 or
half-power amplitude.)
6. Note that the frequency is greater than 100 MHz.